DOMMatrix (WebKitCSSMatrix)
The DOMMatrix
interface represents 4×4 matrices, suitable for 2D and 3D operations including rotation and translation. It is a mutable version of the DOMMatrixReadOnly
interface.
WebKitCSSMatrix
and SVGMatrix
are aliases to DOMMatrix
.
This interface should be available inside web workers, though some implementations don't allow it yet.
Constructor
DOMMatrix()

Creates and returns a new
DOMMatrix
object.
Instance properties
This interface inherits properties from DOMMatrixReadOnly
, though some of these properties are altered to be mutable.
is2D
Read only
A Boolean flag whose value is
true
if the matrix was initialized as a 2D matrix. Iffalse
, the matrix is 3D. isIdentity
Read only
A Boolean whose value is
true
if the matrix is the identity matrix. The identity matrix is one in which every value is0
except those on the main diagonal from topleft to bottomright corner (in other words, where the offsets in each direction are equal). m11
,m12
,m13
,m14
,m21
,m22
,m23
,m24
,m31
,m32
,m33
,m34
,m41
,m42
,m43
,m44

Doubleprecision floatingpoint values representing each component of a 4×4 matrix, where
m11
throughm14
are the first column,m21
throughm24
are the second column, and so forth. a
,b
,c
,d
,e
,f

Doubleprecision floatingpoint values representing the components of a 4×4 matrix which are required in order to perform 2D rotations and translations. These are aliases for specific components of a 4×4 matrix, as shown below.
2D
3D equivalent
a
m11
b
m12
c
m21
d
m22
e
m41
f
m42
Instance methods
This interface includes the following methods, as well as the methods it inherits from DOMMatrixReadOnly
.
DOMMatrix.invertSelf()

Modifies the matrix by inverting it. If the matrix can't be inverted, its components are all set to
NaN
, andis2D
returnsfalse
. DOMMatrix.multiplySelf()

Modifies the matrix by postmultiplying it with the specified
DOMMatrix
. This is equivalent to the dot productA⋅B
, where matrixA
is the source matrix andB
is the matrix given as an input to the method. Returns itself. DOMMatrix.preMultiplySelf()

Modifies the matrix by premultiplying it with the specified
DOMMatrix
. This is equivalent to the dot productB⋅A
, where matrixA
is the source matrix andB
is the matrix given as an input to the method. Returns itself. DOMMatrix.translateSelf()

Modifies the matrix by applying the specified vector. The default vector is
[0, 0, 0]
. Returns itself. DOMMatrix.scaleNonUniformSelf()
Deprecated
Modifies the matrix by applying the specified scaling on the X, Y, and Z axes, centered at the given origin. By default, the Y and Z axes' scaling factors are both
1
, but the scaling factor for X must be specified. The default origin is(0, 0, 0)
. Returns itself. DOMMatrix.scaleSelf()

Modifies the matrix by applying the specified scaling factors, with the center located at the specified origin. Also returns itself. By default, the scaling factor is
1
for all three axes, and the origin is(0, 0, 0)
. Returns itself. DOMMatrix.scale3dSelf()

Modifies the matrix by applying the specified scaling factor to all three axes, centered on the given origin. Returns itself.
DOMMatrix.rotateSelf()

Modifies the matrix by rotating itself around each axis by the specified number of degrees. Returns itself.
DOMMatrix.rotateAxisAngleSelf()

Modifies the matrix by rotating it by the specified angle around the given vector. Returns itself.
DOMMatrix.rotateFromVectorSelf()

Modifies the matrix by rotating it by the angle between the specified vector and
(1, 0)
. Returns itself. DOMMatrix.setMatrixValue()

Replaces the contents of the matrix with the matrix described by the specified transform or transforms. Returns itself.
DOMMatrix.skewXSelf()

Modifies the matrix by applying the specified skew transformation along the Xaxis. Returns itself.
DOMMatrix.skewYSelf()

Modifies the matrix by applying the specified skew transformation along the Yaxis. Returns itself.
Static methods
This interface inherits methods from DOMMatrixReadOnly
.
fromFloat32Array()

Creates a new mutable
DOMMatrix
object given an array of singleprecision (32bit) floatingpoint values. If the array has six values, the result is a 2D matrix; if the array has 16 values, the result is a 3D matrix. Otherwise, aTypeError
exception is thrown. fromFloat64Array()

Creates a new mutable
DOMMatrix
object given an array of doubleprecision (64bit) floatingpoint values. If the array has six values, the result is a 2D matrix; if the array has 16 values, the result is a 3D matrix. Otherwise, aTypeError
exception is thrown. fromMatrix()

Creates a new mutable
DOMMatrix
object given an existing matrix or an object which provides the values for its properties.
Usage notes
The matrix defined by the DOMMatrix
interface is comprised of four rows of four columns each. While it's beyond the scope of this article to explain the mathematics involved, this 4×4 size is enough to describe any transformation you might apply to either 2D or 3D geometries.
Here are the positions of the 16 elements (m_11 through m_44) which comprise the 4×4 abstract matrix:
$$\backslash left\; [\; \backslash begin\{matrix\}\; m\_\{11\}\; \&\; m\_\{21\}\; \&\; m\_\{31\}\; \&\; m\_\{41\}\; \backslash \backslash \; m\_\{12\}\; \&\; m\_\{22\}\; \&\; m\_\{32\}\; \&\; m\_\{42\}\; \backslash \backslash \; m\_\{13\}\; \&\; m\_\{23\}\; \&\; m\_\{33\}\; \&\; m\_\{43\}\; \backslash \backslash \; m\_\{14\}\; \&\; m\_\{24\}\; \&\; m\_\{34\}\; \&\; m\_\{44\}\; \backslash end\{matrix\}\; \backslash right\; ]$$The DOMMatrix
interface is designed with the intent that it will be used for all matrices within markup.
Specifications
Specification 

Geometry Interfaces Module Level 1 # DOMMatrix 
Browser compatibility
BCD tables only load in the browser
See also
 Its nonmodifiable counterpart,
DOMMatrixReadOnly